Using e-mail recruitment and an online questionnaire to establish effect size: A worked example

BACKGROUND: Sample size calculations require effect size estimations. Sometimes, effect size estimations and standard deviation may not be readily available, particularly if efficacy is unknown because the intervention is new or developing, or the trial targets a new population. In such cases, one w...

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Detalles Bibliográficos
Autores principales: Kirkby, Helen M, Wilson, Sue, Calvert, Melanie, Draper, Heather
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2011
Materias:
Research Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3130700/
https://www.ncbi.nlm.nih.gov/pubmed/21658219
http://dx.doi.org/10.1186/1471-2288-11-89

Internet

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3130700/
https://www.ncbi.nlm.nih.gov/pubmed/21658219
http://dx.doi.org/10.1186/1471-2288-11-89

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